A cop testifying yesterday at the civil trial of a Wall Street financial worker who claims police sodomized him with a baton said he saw no one wielding such a weapon when officers responded to the man’s address on a domestic-violence call.

And he told Manhattan federal court jurors that the plaintiff, who was then a criminal suspect, did not complain about any injuries while in custody.

Ralph Johnson, who is suing the NYPD, said he never saw who jabbed him in the rectum when cops came to his Bronx apartment to settle a dispute with his then girlfriend in 2004, but felt a “sharp pain” after he was pinned down and his legs were pried apart.

Antonio Papallo, one of several cops who responded to a neighbor’s call, said he saw no one holding Johnson’s legs after officers busted down the apartment door.

The city’s attorney said Johnson’s injuries were “minor” and could have been caused by constipation or a medical exam.